Whilst Stylized Looks is far more than a simple toon shading system, it sure does render a beautiful toon if you so desire!
Clean Toon with 1 Distant Light
Demo video with Toon Shader overview in Midnight Rebel scene
Demo video with Toon Shader overview in Shipshape Maya scene
Demo video with Toon Shader Light Groups
Demo video with Toon Shader + Hatching Shader working together